package com.jihu.mall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.jihu.mall.common.to.es.SkuEsModel;
import com.jihu.mall.common.utils.R;
import com.jihu.mall.search.config.ElasticSearchConfig;
import com.jihu.mall.search.constant.EsConstant;
import com.jihu.mall.search.feign.ProductFeignService;
import com.jihu.mall.search.service.SearchService;
import com.jihu.mall.search.vo.AttrResponseVo;
import com.jihu.mall.search.vo.BrandVo;
import com.jihu.mall.search.vo.SearchParam;
import com.jihu.mall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author jihu
 * @date 2020/10/26
 */
@Service("searchService")
public class SearchServiceImpl implements SearchService {

    @Autowired
    private RestHighLevelClient esClient;

    @Autowired
    private ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam param) {
        //1.动态构建出查询需要的DSL语句
        SearchResult result = null;
        //1.准备检索请求
        SearchRequest searchRequest = builderSearchRequest(param);


        try {
            //2.执行检索请求
            SearchResponse response = esClient.search(searchRequest,ElasticSearchConfig.COMMON_OPTIONS);
            result = builderSearchResult(response,param);
            //3.分析相应数据封装成我们需要的格式
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 准备检索请求
     * @return
     */
    private SearchRequest builderSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建dsl语句

        /**
         * 查询 模糊匹配膜 过滤(按照属性，分类，品牌，价格区间，库存)
         */
        //构建bool    -   query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must  模糊匹配
        if(StringUtils.isNotBlank(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }

        //1.2 bool  - filter 按照三级分类id查询
        if(param.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }

        //1.2 bool  -   filter 按照品牌id集合查询
        if(CollectionUtils.isNotEmpty(param.getBrandId())){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }

        //1.2 bool  -   filter 按照所有指定的属性进行查询
        if(CollectionUtils.isNotEmpty(param.getAttrs())){
            param.getAttrs().forEach(attr ->{
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //attr = 1_5寸:8寸
                String[] s = attr.split("_");
                String attrId = s[0];//检索属性id
                String[] attrValue = s[1].split(":");//这个属性检索用的值
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValue));
                //每一个都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            });

        }

        //1.2 bool  -   filter 按照库存是否有进行查询
        if(param.getHasSock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasSock()==1));
        }

        //1.3 bool  -   filter 按照价格区间进行查询 1_500/_500/1_
        if(StringUtils.isNotBlank(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");
            if(s.length == 2){
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length ==1){
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }else if(param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1、排序
        if(StringUtils.isNotEmpty(param.getSort())){
            String sort = param.getSort();
            String[] sortParam = sort.split("_");
            SortOrder order = sortParam[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(sortParam[0],order);
        }

        //2.2、分页 pageSize:5
        // pageNum 1 from:0 size=5
        // pageNum 2 from 5
        // from = (pageNum-1) * pageSize
        sourceBuilder.from((param.getPageNum()-1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3、高亮
        if(StringUtils.isNotEmpty(param.getKeyword())){
            HighlightBuilder highlightBuilder = new HighlightBuilder();

            highlightBuilder.field("skuTitle")
                    .preTags("<b style='color:red'>")
                    .postTags("</b>");
            sourceBuilder.highlighter(highlightBuilder);
        }

        /**
         * 聚合分析
         */
        //1.品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(10);

        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //2.分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3.属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");

        //聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //聚合分析出当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //聚合分析出当前attr_id对应的所有可能的属性值
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);
        SearchRequest searchRequest = new SearchRequest()
                .indices(EsConstant.PRODUCT_INDEX)
                .source(sourceBuilder);
        return searchRequest;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult builderSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result = new SearchResult();
        //1.返回的所有查询到的商品
        SearchHits hits = response.getHits();
        if(hits.getHits() != null && hits.getHits().length > 0){
            List<SkuEsModel> esModels = new ArrayList<>(hits.getHits().length);
            for (SearchHit hit : hits.getHits()) {
                String hitJsonString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(hitJsonString, SkuEsModel.class);
                if(StringUtils.isNotEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
            result.setProducts(esModels);
        }

        //2.当前所有商品涉及到的所有属性信息
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        if(CollectionUtils.isNotEmpty(attr_id_agg.getBuckets())){
            List<SearchResult.AttrVo> attrVos = new ArrayList<>(attr_id_agg.getBuckets().size());
            for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
                SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
                //1.得到属性的id
                long attrId = bucket.getKeyAsNumber().longValue();
                //2.得到属性的名字
                String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();

                //4.得到属性的所有值
                List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                    String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                    return keyAsString;
                }).collect(Collectors.toList());
                attrVo.setAttrId(attrId);
                attrVo.setAttrName(attrName);
                attrVo.setAttrValue(attrValues);

                attrVos.add(attrVo);
            }
            result.setAttrs(attrVos);
        }


        //3.当前所有商品涉及到的品牌信息
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        if(CollectionUtils.isNotEmpty(brand_agg.getBuckets())){
            List< SearchResult.BrandVo> brandVos = new ArrayList<>(brand_agg.getBuckets().size());
            for (Terms.Bucket bucket : brand_agg.getBuckets()) {
                SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
                //1.得到品牌的id
                brandVo.setBrandId(bucket.getKeyAsNumber().longValue());
                //2.得到品牌名
                String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();

                //3.得到品牌的图片
                String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
                brandVo.setBrandImg(brandImg);
                brandVo.setBrandName(brandName);

                brandVos.add(brandVo);
            }
            result.setBrands(brandVos);
        }

        //4.当前所有商品涉及到的分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        if(CollectionUtils.isNotEmpty(buckets)){
            List<SearchResult.CatalogVo> catalogVos = new ArrayList<>(buckets.size());
            for (Terms.Bucket bucket : buckets) {
                SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
                String keyAsString = bucket.getKeyAsString();
                catalogVo.setCatalogId(Long.parseLong(keyAsString));
                //得到分类名
                ParsedStringTerms  catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
                catalogVo.setCatalogName(catalog_name_agg.getBuckets().get(0).getKeyAsString());
                catalogVos.add(catalogVo);
            }
            result.setCatalogs(catalogVos);
        }

        //5.分页信息-页码
        result.setPageNum(param.getPageNum());
        //5.分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //5.分页信息-总页码
        int totolPages = total % EsConstant.PRODUCT_PAGESIZE == 0 ? (int) total/EsConstant.PRODUCT_PAGESIZE :((int) total/EsConstant.PRODUCT_PAGESIZE) +1;
        result.setTotalPages(totolPages);

        //6.构建面包屑导航功能
        if(CollectionUtils.isNotEmpty(param.getAttrs())){
            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(attr ->{
                //1.分析每个arrts传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();

                String[] split = attr.split("_");
                R r = productFeignService.attrInfo(Long.parseLong(split[0]));
                result.getAttrIds().add(Long.valueOf(split[0]));
                if(r.getCode() == 0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {});
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(split[0]);
                }
                //2.取消了面包屑后 我们要跳转到那个地方 将请求地址的url里面的当前置空
                navVo.setNavValue(split[1]);
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(navVos);
        }

        //平牌、分类
        if(CollectionUtils.isNotEmpty(param.getBrandId())){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();;
            navVo.setNavName("品牌");

            //TODO 远程查询所有品牌
            R r = productFeignService.brandInfo(param.getBrandId());
            if(r.getCode() == 0){
                List<BrandVo> brands = r.getData("brands", new TypeReference<List<BrandVo>>() {});
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brand : brands) {
                    buffer.append(brand.getName()+";");
                    replace = replaceQueryString(param,brand.getBrandId()+"","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
            }
            navs.add(navVo);
        }
        return result;
    }

    private String replaceQueryString(SearchParam param, String attr, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(attr, "UTF-8");
            encode = encode.replace("+","%20");//浏览器对空格编码和java不一样
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&"+key+"=" + encode, "");
    }
}
